金属泡沫-翅片复合结构强化相变蓄热的实验研究  

Visualized Experimental Study on the Phase Change Heat Storage Enhanced with Metal Foam

作　　者：田伟 梁晓光 党硕 刘罡 杨肖虎[2] TIAN Wei;LIANG Xiaoguang;DANG Shuo;LIU Gang;YANG Xiaohu(China United Northwest Institute for Engineering Design&Research Co.Ltd.,Xi’an 710061,China;School of Human Settlements and Civil Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]中联西北工程设计研究院有限公司,西安710061 [2]西安交通大学人居环境与建筑工程学院,西安710049

出　　处：《西安交通大学学报》2021年第11期17-24,共8页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51976155);中央高校基本科研业务费资助项目(xtr042019019)。

摘　　要：为了对竖直方腔内嵌金属泡沫复合石蜡相变蓄热材料的蓄热特性进行探究,自主设计搭建了相界面可视化的相变蓄热实验台,对纯石蜡、添加金属泡沫及添加翅片-金属泡沫3种结构进行了实验探究。在熔化过程中使用固定高清相机拍摄相界面变化,在蓄热装置内布置热电偶测点记录熔化过程中距底板相同距离的温度变化规律。实验结果表明:在70℃的热源温度下,金属泡沫的加入对完全熔化时间的影响起主导作用,添加铜泡沫组的完全熔化时间缩短为纯石蜡组的56.53%;添加翅片对完全熔化时间影响较小,主要影响蓄热装置内部的温度均匀性。翅片-铜泡沫组的相界面以翅片为中心移动,且整个蓄热装置内部受翅片影响,在固相升温阶段和相变阶段结束初期温度升高速率均会有较明显提升。To study the heat storage characteristics of a square phase change heat storage unit in the vertical direction,a phase change heat storage experimental rig with visualized phase interface was designed and built independently.Three structures of pure paraffin,metal foam,and fin-metal foam were experimentally explored.In the experiment,a fixed camera was used to shoot the change of phase interface during melting,and thermocouple measuring points were arranged in the heat storage unit to record the temperature change at certain distances from the bottom plate.Results indicated that at the heat source temperature of 70℃,the addition of metal foam played a leading role in the effect on the complete melting time.The total melting time of the copper foam group was 56.53%of that of the pure paraffin group.Nevertheless,adding fins had little effect on the total melting time,mainly affected the temperature uniformity in phase change materials.The phase interface of the fin-copper foam group moved with the fin as the center,and the temperature rising rate of the whole heat accumulator increased obviously in the solid-phase heating stage and at the end of phase transition stage.

关 键 词：相变蓄热 多孔介质 可视化实验 固液相变 

分 类 号：TK124[动力工程及工程热物理—工程热物理]